While I'd be interested in the track record data, it is hard to properly metric these professions. How do you control for a priori risk of a patient (IE- one total knee case is a 70 year old smoker so ways 300 lbs and the other is a 28 year old athlete who fell skiing.) The ACA has resulted in the collection of this type of data and we'll probably see it released someday. We'll almost certainly see complication rates reduced and risky v patients refused certain types of care, but I do feel bad for the professions getting metriced like this. After all, I'd be pretty pissed if my value as a software developer was judge entirely by my bugs/KSLOC number.